The instrument adopts the most advanced chemical principle and the most advanced biomedical engineering technology. Electrochemiluminescence technology is a new generation of marker immunoassay technology after radioimmunoassay, enzyme immunoassay and chemiluminescence immunoassay, and it is the only instrument that can perform fully automatic detection of three items of tumor markers, namely, cancer antigen, non-small-cell lung cancer antigen, and neuron-specific enolase. The instrument utilizes standard electrochemical luminescence reagents and is the most advanced instrument for immunoassay with wide test range, stable reagents and high sensitivity.